“synchronous digital hierarchy network”的概念、定义、翻译、参考文献-科学参考

单词	synchronous digital hierarchy network
释义	synchronous digital hierarchy network Encyclopedia 工学传送网释 synchronous digital hierarchy network同步数字传送网基于同步数字传送体系组建的传送网。由一些同步数字传送网元组成，在光纤上进行同步数字信息传输、复用和交叉连接的网络，实现网络管理、实时业务监控、不同厂商设备间的互通等功能，提高网络资源利用率。
随便看	airworthiness design assurance system airworthiness design compliance airworthiness directives airworthiness flight test for civil aircraft verification airworthiness noise test airworthiness of aircraft airworthiness production approval airworthiness regulation airworthiness regulations airworthiness status of civil aircraft Airy airy Airy crater Airy differential equation Airy diffraction pattern Airy disk Airy-Fock function Airy function Airy-Heiskanen isostatic model Airy integral Airy projection Airy stress function Airy transit circle Airy wave theory Airy zeta-function

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